Well my current ranking system, based purely on 'fit' mind, is like this:-
Tier One (in no particular order ):- Irvine, UMich, Brown, Rutgers
Tier Two (ditto):- Austin, NYU
Tier Three (ditto):- Boston Uni, UIUC
Tier Four:- Northwestern
The short answer is yes Irvine is one of my top choices on the basis of fit but I haven't really considered academic reputation, placement rate or lifestyle yet (by the way did you receive a long email from Bill Maurer and a shorter one from Tom Boellstorff as well). On the last score I've heard some pretty negative things about Irvine's public transport which as someone who refuses to drive and likes to walk/take PT everywhere are quite concerning.
Returning to your original question I will probably take up the department offer to go and see Irvine. However, I am going to hold off making a decision until next week when hopefully I've heard back from a few more schools. Then if I am lucky enough to receive another acceptance I can take one trip as opposed to having to fly over the Atlantic more than once in the space of weeks.